Liquid fuel burner apparatus



y 1950 M. A. POWERS 2,515,262

LIQUID FUEL BURNER APPARATUS Filed June 23, 1944 5 Sheets-Sheet 1 July 18, 1950 POWERS 2,515,262

LIQUID FUEL BURNER APPARATUS Filed June 23, 1944 5 Sheets-Sheet 2 Fly. f.

31 14) cwto'a M/LTo/v A. POM/EH5 July 18, 1950 M, POWERS 2,515,262

LIQUID FUEL BURNER APPARATUS Filed June 25, 1944 5 Sheets-Sheet 3 M/L TON A. POWERS .mal operation.

Patented July 18, 1950 LIQUID FUEL BURNER APPARATUS Milton A. Powers, Detroit, Mich., assignor to The Company, Detroit, Mich.,

Timken-Detroit Axle a corporation of Ohio Application June 23, 1944, Serial No. 541,815

13 Claims.

This invention relates to improvements in liquid fuel burning devices and has particular reference to improvements in a liquid fuel burning device of the type disclosed in United States Letters Patent No. 2,270,994, issued January 27, 1942, to Frank 0. Cole for Liquid Fuel Burning Apparatus.

Oil burners wherein the fuel distributing mechanism comprises a rotary head driven by an electric motor are usually subject to objectionable mechanical vibrations and noises which are annoying to the senses and may even cause breaks in the oil or electric supply lines. Attempts have been made to reduce such vibration and noise, as by different types of mounting arrangements, but none has proved commercially successful to my knowledge.

The present invention contemplates mounting the entire burner motor rotor and rotary fuel distributing head driven thereby on a special vibration and noise dampening and absorbing support which effectively dampens and absorbs vibrations and prevents their transmission to the burner stand.

A major object of the invention is therefore the provision of a novel-motor driven liquid fuel burner apparatus which is substantially free of noise and vibration.

A further object of the invention is to provide a liquid fuel burner apparatus wherein the burner motor and. the fuel distributing mechanism are supported on a novel resilient mount to eliminate the undesirable effects of vibration during nor- A further object of the invention is to provide a novel liquid fuel burner apparatus wherein a motor and fuel distributor assembly rests on a support with which it has a flexible connection permitting only limited relative rotation of the assembly and support. p v

- A further object of the invention is to provide a novel resilient mounting "device wherein a resilient body is secured between appreciably more rigid inner and outer shells, at least one of said shells being slightly radially stretchable or similarly radially deformable for permitting forced installation.

Other objects and advantages will be more particularly pointed out hereinafter or will become apparent as the description proceeds.

In the accompanying drawings, in which like reference numerals are .used to designate similar parts throughout, there is illustrated a suitable .mechanical embodiment for the purpose of disclosing the invention. The drawings, however, are for the purpose of illustration only and are 2 not to be taken in a-limiting or restrictive sense, since it will be apparent to those skilled in the art that various changes in the illustrated construction may be restored to without in any way exceeding the scope of the invention.

In the drawings:

Figure l is an elevation partly in section through a liquid fuel burner apparatus constructed according to a preferred embodiment of the invention;

Figure 2 is a sectional elevation on an enlarged scale of the burner mechanism Of Figure 1;

Figure 3 is a bottom plan View of the motor housing of theburner unit, as indicated by line 3-3 of Figure 2, with the resilient bushing core member and associated parts omitted;

Figure 4 is a transverse section on line 4-4 of Figure 2; and

Figure 5 is a fragmentary section taken on the line 5-5 of Figure 2, illustrating the air control band and adjacent portions of the motor housin with the air admission openings closed.

Referring to the drawings-in detail and particularlyto Figure 1, the burner apparatus is provided with a stand or housing, preferably shaped as a half hollow cylinder and generally indicated at H! carrying in its lowerportiona transformer l2, and in its upper portion a liquid fuel pumping and distributing unit generally indicated at I4.

Stand It] comprises a: curved, tapered support member l6, preferably of relatively heavy sheet metal and generally semi-circular transverse cross-section, mounted at its lower end upon a base l8 and closed at its upper end by an annular preferably circular burner collar 20. In the arrangement illustrated, base I8 is a sheet metal plate having an upwardly bent peripheral flange I9 into which the lower end of support member l6 extends and to which it is secured by suitable means such as welding or brazing.

Base plate I 8 has transformer l2 secured thereto by suitable means suchv as latch connection 22 and retaining screw 24, and also carries a plurality of adjustable legs, two of which are indicated at 26 and 28 in Figure 1. There are preferably three of these adjustable legs, each comprising a threaded bolt 25 extending through an internally threaded collar 21 welded or otherwise secured to base plate I8 and fixed in adjusted position by a suitable lock nut 29 beneath plate [8.

An electrical supply connection 30 leads into transformer l2, and suitable high potential connections are provided betweenv the transformer and the fuel igniter. associated with the combus- 3 tion chamber of the heating device, preferably in the manner disclosed in the above mentioned Patent 2,270,994.

Burner collar is preferably made of formable but relatively heavy sheet metal and is provided with an integral annular radial flange 32 which is substantially horizontal in normal operative position. An integral rim 34 extends downwardly from annular flange 32 and is secured to an interfitting rim 35 integral with the upper end of support It by suitable means, such as weld+ ing or brazing. Burner collar ZUisprovidedwith an upper internal radial flange 36' and a central aperture 31 through which the fuel distributor head projects. Collar 20 is preferably of cone shape, being inwardly flared towards its upper end. Flange 36 serves to direct cornbgstion air towards the center of the fuel distributor head fan as will appear. I

Transformer [2 is preferably enclosed by a rounded fcover .318 preferably formed of sheet metal thinner than themetal of supp t I6 a d base 1:8, and fuel pumping and distributing unit '14 isjlaterally enclosed :by a cover '49 formed of relatively thin sh'eet metal and rof generally semicircular cross-sectional form. Cover 40 is apertured at L41 for communication with the space inwardly of flange 13.4; so that flange 34' and cover All comprise a substantially continuous. cover arrangement. Covers 38 and 4B are suitably joined 'to'support It at-a'djoining edges, so that covers 38 and it in effect comprise lower and upper extensions of housing stand Hi.

An open top, generally cupsshaped, sheet metal motor housing or casing 42 is provided at its upper open end with an outwardly extending annular radial. flange 1114. A soft flexible annular gasket 46, formed of asbestos or some other suit,- able non-inflammable material, is interposed between flange 44 and burner collar flange 32. Casing $2 is secured to 'burner collar 20 by some suitab e means, such as a plurality .of suspension bolts, one of which is indic'atedat '48, each provided with a head resting on the upper surface of burner collar flange 32' and passingv at their lbwer ends through apertures in suitable radial brackets rigid with the bottom of casing .42. flasing a2 is forced upwardly against gasket 46 when living nuts 52 on the lower ends of bolts 48 are tightened, thus providing a fluid tight shock 1 cated below the bottom wall 'of casing '42 for accessibility. The bottom of motor casing 42 is also provided with a side aperture through which extends an electrical conduit 58 adapted to contain power leads '(not shown) for supplying current to the burner motor.

Clamp ring 54 is mounted "on the bottom wall "of motor casing "42 by means of a plurality of radially extending -arms 60 supported "on the upper surface of a horizontal seating flange 6| 'e'i'r'tendin g partially about the periphery of aperture 53. Clamp ring 5'4 closely surrounds a "cylindrical resilient: bushing 62 which consists or an outer cylindrical metal shell 63, an inner concentric cylindrical metal shell 64 "and a cylind ri'cal body sleeve '65 of resilient material such as relatively soft rubber disposed between the two shells. Sleeve 65 is preferably held under compression between the shells.

Bushing 62 supports a hollow core member generally indicated at 65. Core member 66 has an externally substantially cylindrical lower portion 6'! terminating in a rounded bottom formed with an internally thre'afd'ed side aperture into which fuel line terminal 6% is coupled. Core member 66 is preferably formed as a die casting and the external surface of lower portion '61 may have a slight inward taper from its lower end to facilitate removal from the die in which it is This taper may be very slight and usually does not exceed a five degree angle in present die casting practice. This factor in practice malges bushing 52. receiving lower portion 61 of iii) the core member substantially frusto-conical to a slight degree and might be expected to interfere with locating the inner shell of the resilient bush o nithe 'ccueme mb'er without first 'siubieci'rinlg the-coremember to ama'chining operation. I have found, however, that by making bushing inner shell 6 3' of a soft stretchable metal, such as copper or aluminum','bushing :32 can be forced onto the slightly 'frustO-conical portion of the "core member and becomes firmly secured thereto by frictional adhesion, and no a-ddedmachiming of the surface at bl is necessary.

Although inner shell '64, which is initially of about the same internal. diamete as the outside cliafnete'r'at 3?, is stretched when forced onto 'c'ore member, its inherent resiliency urges it to contract about theupp'er regions of surface 67, so that shell '64 frictionally grips surface 61 over a wide surface area.

In assembly, bushing 62'is forced onto portion 67 of core member 5t, and then clamp -ring 54' is tightened about bushing 32.

Aside from its special adaptation for an oil burner motor andh'e ad support in the preferred "embodiment or the invention, the above-.de scribed resilient bushing per se is an important phase or the invention.

' il'e have describeda bushing wherein only the'ih ner 'shell 64' is stretchable, it is clear that either the inner shell M or outer shell '63, or both, may be stretchable for de'siredforce' fitting to associated "parts rot hly of the required size for eliminating expensive machining operations.

Preferably, as stated above, the stretchable shell 'or shells are made of copper or aluminum, but they may be of brass, lead, fibrous materials, resilient plastics or' even may comprise sections of woven steam hose ving sufficient wall rigidity to provide adequate lateral support.

It to be observed that these radially deformable shells may be stretched or contracted in one longitudinal zone while 'remainingunstressed in another longitudinal zone so that the bushing may be mesa forexample over a'surface which is irregular both longitudinally and radially and the associated shell will adapt itself under stress to all such surface irregularities and provide a tight grip.

Core member 66 contains a bottom well 69 into which fuel line terminal 68 opens. The upper end of well 9 opens into a larger cylindrical bore 10 having two diametrically opposed internal wall grooves H and 1:2 which extend upwardly through cylindrical portion 61 of core member 66. Bore H1 is thus an effective continuation of well 69. Grooves "H and' 12 (see Figure 2') have inclined outer side walls so that they provide fluid passages of gradually andv constantly increasing cross-secof the annular portion 82.

"plate 92 to flange 18 of core member 66. motor illustrated is of the shaded pole alternating current type and has a plurality of coils, indicated at 96 and 98, suitably mounted on stator tion from theirlower to upper ends. The lower end of groove H is also in fluid communication with well 69 by a radial passage I3. The lower end of bore forms a flat horizontal shoulder I4 for seating a coil spring I5 which supports on its upper end a hard flat metal bearing step plate 16. "Fluid communication between grooves 'II and I2 is obtained through the lower end of bore I0 containing spring I5.

I At the upper end of portion 61, core member 66' is formed with an integral outwardl extending radial flange I8 provided on its upper surfacewith a horizontal step 80 and an annular lateral pilot surface 8I concentric with core memher-"66. Above flange 18, core member 66 comprises an upwardly extending annular portion 82 the inner cylindrical surface 83 of which is substantially parallel to the axis of core member 66 and the outer surface 84 of which is tapered slightly upwardly and inwardly.

A tubular, preferably cylindrical elongated bearing sleeve 85 has a reduced externally threaded lower end 88 screw-threaded into an internally threaded section of bore I0 above bearing step I6. Bearing sleeve 85 is provided with a downwardly facing external shoulder 81 which seats upon an upwardly facing annular flat horizontal surface 88 of core member 66 at the bottom As illustrated in Figure 2, grooves II and 12 have increasingly flared upper end passage sections 89 and 98 respectively whichopen upwardl at the level of surface 88.

'Above shoulder 8'! sleeve 85 preferably has a straight cylindrical portion which extends appreciably above the level of annular portion 82 of tion thereof.

The flange I8 carries on its upper surface an "annula'r'plate 92 centered on pilot shoulder BI andsuitably supporting an annular motor stator 94 surrounding and annularly spaced from annular upper portion 82 of core member 66. Suitable fastening means such as machine screws 95 secure The 94 and electro-magnetically cooperating therewith. By this construction the stationary por- 'tion of the burner distributor head motor is rigidly secured to core member 66 and is thus resiliently supported by resilient bushing 62.

I A vertical pin ISO is non-rotatably secured at its upper end to flange I8 and extends downwardly through a notch I02 provided in motor casing 42 at the edge of the aperture 53. Notch I82 is lined with a soft rubber grommet I84 so that pin I00 tween the motor and the casing 42 supporting it and thus avoids stretching or fouling of the electric leads to the motor.

A distributor head shaft I66 extends through bearing sleeve 85 to a terminal materiably above burner collar cone 2!], and is provided at its lower end with asuitable point bearing, such as ahardthereof. oil flows upwardly through grooves II and 12 and ened steel ball I01, resting upon bearing step I6. At a location immediately above the upper end of the bearing sleeve 85, an inverted cup-shaped fuel distributor head I08 is non-rotatably secured to shaft I08, concentrically therewith. Internally, distributor head I88 is formed with an upper central recess I89 above the upper end of bearing sleeve 85, an intermediate annular downwardly outwardly flared wall H8 and a lower internal cylindrical wall III. Distributor head I88 has an outwardly extending integral annular flange II2 to which there is secured a burner motor rotor H4, as by a plurality of cap screws IIIS. When the parts are in the assembled relation shown in Figures 1 and 2, rotor H4 is located in and substantially fills the space between the interior of the stator 94 and the outer surface of annular portion 82 of core member 85, with suitable clearance however to permit operative rotation.

On its upper end, shaft 906 carries a flanged cap II8 which supports a suitable air directing fan I28 comprising an apertured sheet metal disc I22 secured at its center to cap H8 and carrying on its under surface a plurality of vertically disposed fan blades I24. A suitable set screw I23 locks the fan non-rotatably to shaft I85. Blades I24 are directed generally radially outwardly from shaft I06, but may be more or less inclined toward a tangential position in order to provide desired conditions of combustion air volume, speed and direction of flow.

A pair of identical oil flinger tubes I26 and I28 are secured at their lower ends within the upper wall of distributor head I88 so as to be in fluid communication with the interior of head I88 and extend upwardly and outwardly in diametrically opposite directions to spaces between fan blades I24. The upper ends of tubes I 26 and I28 are bent outwardly relative to shaft I06, and are inclined upwardly from the horizontal by a small amount. Tubes I26 and I28 terminate radially inwardly of the outer edges of the fan blades as illustrated.

The portion of the bearing sleeve above shoulder 81 is surrounded by a hollow frustoconical fuel lifting pump member I 32. Pump member I32 has its larger upper end formed with an integral outwardly turned flange I3l rigidly and non-rotatably secured as by force fit within distributor head I88 against a downwardly facing shoulder I33 and in contact with inner cylindrical surface II I, so that pump member I32 rotates with head I08 and rotor I I4.

The smaller lower end of member I32 is slightly spaced vertically from upwardly facing surface 88 of core member 68 and closely surrounds the adjacent portion of the bearing sleeve 85, the annular fluid admitting space I35 between the lower end of member I32 and bearing sleeve 85 having a restricted predetermined area which prevents excessively rapid changes in the flow of fuel into pump member I32. Pump member I32 is provided intermediate its length with an external annular flange I36 constituting a dam or throwoff ring which prevents liquid fuel from creeping up the external surface of pump member I32 and over the upper end of the annular portion 82 of the core member. This arrangement serves to keep the motor and the interior of the motor and the casing free of fuel oil.

Flow of fuel oil is from the float chamber and automatic valve through a fuel line and the connection 68 into core member I56 at the lower end From the bottom of the well 69 the fuel passages 89, 99 into the reservoir space within the-lower part of annular portion 82 of core mem-. her 66, from where the fuel is picked up by conical pump or fuel lifting member I32 and raised into head I68 and the lower ends of distributing tubes I26 and I28. The latter throw the oil outwardly by centrifugal force in a direction generally radially of the burner head. The fuel is drawn upwardly through rotating pump member I32 and tubes I25 and I28 by reason of the generally upwardly flaring conical construction of these members and because the flow action, when the burner is operating, creates a pressure within pump member I32 and tubes I26 and I28: slightly less than the atmospheric pressure acting on the fuel in the reservoir at 82.

Oil arising in bore lubricates spring I5, bearing 16 and the lateral shaft bearing with sleeve 85.

As shown in Figure 1, motor casing 42 is of greater diameter than the stator 94 thus providing therewithin an annular space entirely surrounding the motor unit. Casing 42 is provided with combustion air admission openings, indicated at I38, I46, I42, and M4 in Figure 5, the size of which may be adjusted by means of an adjustable apertured band I46 surrounding the portion of casing 42 provided with the openings. Band I46 is provided with corresponding registrable openings of similar shape and area to openings I38--I44, and is slidable circumferentially of the motor casing to adjust the effective size of these air openings. Band I46 may be clamped in adjusted' position by suitable means such as the machine screw assembly I48 extending through a pair of apertured lugs carried by the radially outwardly bent end portions of band M6.

At each opening band I45 is formed with an inwardly projecting lug I41 which extends within the corresponding opening in motor casing 42 and forms stop means defining fully open and closed limits of the registered openings. Band I46 can thus be rotated only clockwise toward open position from the closed position illustrated in Figure 5.

ihe combustion air is drawn into stand It beneath the lower edge of burner unit cover 411 and upwardly through the space surrounding the motor casing t2 and through the air admission openings in motor casing 42 to the space between motor casing 42 and motor stator 94 Where its acts to extract excess heat from the operating motor unit. From this space, air flows upwardly through the burner collar 26 and out through aperture 3'! to fan I which forces it radially outwardly toward the hearth.

The portion of the core member 68 projecting below bushing 6-2 is smaller in cross-sectional area than the bushing, so that when oil fitting fiii is removed and clamp ring 54 released, the en tire fuel pumping and distributing mechanism including the motor may be lifted vertically upwardly through the opening in the upper end of burner collar 23 and removed from the motor casing, motor stator 94 being somewhat smaller than aperture 31.

A cover member 59, fitting over the upper portions of coils $6 and the stator 94, enables the mechanism to be removed in this manner without danger of injuring the coils of the motor unit and also assists directing the combustion air upwardly toward aperture 37 in the burner collar. When the mechanism is so removed, pin Iii!) slides readily out of grommet W4 and there is no other connection or obstruction preventing lifting of the mechanism out of the case. The wires providing electrical connection to. the motor have sufficient length to permit raising the motor unit sufiiciently above the top of burner collar 21) so that the wires may be disconnected if it is desired to carry the mechanism away from stand II]. I

Removal of the mechanism from the casing may be carried out in two stages if desired, since the fuel lifting and distributor head unit is re movable separately from the rotor and core meme ber. By simply lifting the fan I20, shaft I06 may be lifted out of bearingsleeve carrying with it distributor head I08, motor armature H4 and pump member I 32 without releasing any fass tening elements, aperture I5I in the top of cover I50 being sufficiently large to permit the motor armature to pass therethrough.

The burner motor and distributor head 111901; anism are thus both supported by resilient b11513! ing 62, so that vibration of any moving part of the mechanism will not betransmitted through the motor casing 52 to stand 10, and the entire fuel pumping and distributing mechanism may be removed from stand It as a unitby merely disconnecting fuel line coupling 63.

In the above construction the motor stator and rotor are all supported entirely by core member 65 which in turn is resiliently mounted on motor casing 42 by means of clamp ring 56 and bushing 62. When nut 55 is tightened, clamp ring 5:4- is drawn frictionally tight upon outer bushing shell I53, and as above described inner bushing shell 64 has a force fit on lower core portion o boss 51. Clamp ring 54 rests on flange SI through arms 60, and core member 6%; is held against ward vertical movement oniy by the weight of the parts it supports. Engagement of pin H10 within grommet W4 prevents undesired turning of core member 66 about its vertical axis during normal operation.

Bushing B2 is sufficiently longitudinally co-extensive with clamp ring 54 and core portion 6'! that core member 66 is laterally supported against tilting during normal operation, so that shaft I96 remains normally vertical. Because'of the resiliency of bushing I52 to torsional and all other forces, vibration and-other shocks of operation are insulated from the motorcasingand normal operation of the device produces no objectionable external vibration or'noise.

The height of the distributor head relative to burner collar 20 .may be varied by loosening clamp ring 5 1 and vertically adjusting core member 66 to bring the head to the desired height and then tightening clamp ring 54 to lock the mechanism with the head in properly adjusted position.

The liquid fuel is carefully metered through the mechanism in such a way that there is no accumulationof excessive quantities of fuel therein and no possibility for the distributor-head to eject slugs of solid fuel upon starting of the burner or to continue to eject fuelif the head slows down upon discontinuing burner operation, so that disagreeable fuel odors and smoke from the burner are eliminated. Furthermore, since burner motor casing 42 is sealed to the stand by deformable gasket 46, there is no air leakage around the top of the stand and no burner fumes are forced into the space outside the heating device, all of the air flowing through the burner unit being directed into the combustion chamber above the fan where all such fumes will eventually be drawn away through the chimney. Gasket '46 between motor casing 42 and stand I I) also eliminates any residual vibration that might be transmitted to the motor casing in spite of the interposition of the resilient bushing 62 between the motor and the casing.

The device is not only extremely easy to as' semble and disassemble for-cleaning andmaintenance purposes, but is so constructed that maintenance and cleaning are seldom, if ever, necessary. The device furthermore constitutes a compact. and economical unit of pleasing appearance that may be installed inliving quarters without any objection as to appearance, noise, vibration or disagreeable burner odor.

Theinvention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning andrange of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured'by United States Letters Patent isz' 1. In a fuel lifting and projecting device, a hollow core member providing a fuel inlet and carrying a motor stator. afiixed thereto and a motor rotor rotatable about said core member; a fuel lifting device rotatable with said motor rotor for raising fuel from said hollow core member; a motor casing having an apertured bottom wall through which said core member projects; a releasable clampv ring seated on said casingand disposed within said aperture; and an annular resilient mounting. having itsinner periphery secured about the lower end of said core member and its outer periphery frictionally gripped by said clamp ring.

2. In the fuel lifting andprojecting device .defined inclaim 1, the lower end of said core member being adjustable axially of said resilient mounting, and being maintain'edin a desired pos'itionof vertical adjustment by said clamp ring.

3.. In a fuel lifting and projecting device as defined in claim 1, said lowerlend portion of said core member being slightly frusto-conical in external contour, and said resilient mounting having an inner shell of stretchable metal having an initial diametersubstantially-the same as the diameter of the smaller end of said frusto-conical core member portion whereby said bushing may be forced onto said core member while stretching said inner shell, and said metal inner shell having the property of tending to return to its initial diameter after the stretching necessary to force it over said core member so that it frictionally grips said core member over a wide surface area.

4. Fuel burner apparatus comprising a stand, a motor casing mounted on said stand and having a bottom wall, a motor driven liquid fuel projecting unit resting upon the bottom wall of said casing, and interengaging parts providing a resilient connection between said unit and said casing permitting such slight relative rotation of said unit and easing as may arise from torsional vibration but preventing substantial relative rotation between said unit and said casing and said parts being separable vertically to permit free upward displacement of said unit for bodily removal from said casing, said casing being otherwise not secured to said unit.

5. In a fuel burning apparatus, a motor driven liquid fuel lifting and projecting unit, a motor casing at least partially surrounding said unit, a. stand supporting said casing, a resilient mounti0 ing between said unit and said casing comprising the only means fastening said unit and casing together; and means providing a substantially fluid tight shock absorbing connection between said casing and said stand.

6. In a fuel burner apparatus, a support having an upwardly facing surface, a mounting for a burner motor and fuel distributor assembly having an elongated boss adjacent its lower end, an annularresilient bushing surrounding said boss, a releasable clamp band surrounding said bushing having opposite ends interconnected by adjustable fastening means, and laterally projecting formations on said clamp band providing rests seating said clamp band on said upwardly facing surface of said support, and a vertically detachable resilient torque absorbing connection between said mounting and said support. Y

7. Fuel burner apparatus comprising a support, a motor casing on said support having a bottom wall provided with an opening, means mounting a motor driven liquid fuel projecting unit on said bottom wall of said casing, and a boss on said unit extending downwardly through said opening, said mounting for the unit comprising a vertically elongated resilient annulus interposed between concentric inner and outer metal members and disposed in said opening with the inner of said members secured to said boss and the outer of said members mounted on said bottom wall ad-. jacent said opening, and said mounting having relatively movable telescoping parts for selecting and maintaining the-vertical position of said unit with respect to said casing.

8. Fuel burner apparatus comprising a relatively stationary motor housing having an aperturedbottom wall, a motor support member projecting upwardly through said apertured bottom wall, a motor comprising a stator secured to said member and a rotor rotatably mounted on said member, a fuel distributor head secured upon said rotor, a fuel inlet passage in said member and means providing supply of fuel from said pas sage to said head during rotation of said rotor, an elongated resilient bushing secured about said member below said stator and extending through said bottom wall aperture,'and means mounting said bushing on said housing at said bottom wall aperture, said bushing being the sole support for said member upon said housing so that the housing is insulated from vibrations in said motor and head assembly.

9. In the fuel burner apparatus defined in claim 8, detachable interengaging parts on said bottom wall of the housing and said member for permitting said member to project through said bottom wall only when in one angular position with respect thereto, and resilient means coacting with said parts to absorb torsional vibrations while .permitting limited relative rotation between said member and said housing.

10. Fuel burner apparatus comprising a relatively stationary motor housing having an apertured bottom wall, a motor support member projecting upwardly through said apertured bottom wall, a motor comprising a stator secured to said member and a rotor rotatably mounted on said member, a fuel distributor head secured upon said rotor, a fuel inlet passage in said member and means providing supply of fuel from said passage to said head during rotation of said rotor, an elongated resilient bushing secured about said member below the stator, means mounting said bushing on said housing at said bottom wall aperture and in alinement therewith, said bushing be-.

11 'ing the sole support for said member on said Pious-- ing'so that the housing is insulated from vibra tioiisin said motor andhead assembly, and a flexible relative rotation resisting connection between said housing and said member.

11. Fuel burner apparatus comprising a relatively stationary motor housing having an ape'rtured' bottom wall, a motor support member projecting upwardly through said apertured bottom wan, a motor comprising a stator secured to said member and a rotor rotatably mounted on said member, a fuel distributor head secured upon said rotor, a fuel inlet passage in said member and means providing supply of fuel from said passage tojsaid head during rotation of said rotor, an elongated resilient bushing secured about said member below the stator, said bushing comprising an annular body of resilient material having inner and outer peripheral shells secured thereto, and means mounting said bushing on said housing at said bottom wall aperture and in alinement therewith comprising means seating the outer shell on said housing bottom wall and means securing said inner shell to said member, said bushing being the sole support for said member upon said housing so that the housing is insulated from vi brations in said motor and head assembly.

12. Fuel burner apparatus comprising a relativly stationary motor housing having an apertured bottom wall, a motor support member projecting upwardly through said apertured bottom wall,- a motor comprising a stator secured to said member and a rotor rotatably mounted on said member, a fuel distributor head secured upon said rotor, a fuel inlet passage in said member and 7 means providing supply of fuel from said pas-- sage tosaid head during rotation of said rotor, a resilient bushing secured about said member below the stator, and means mounting said bushon said housing at said bottom wall aperture comprising a releasable clamp ring surrounding and mounted on said bushing and seated on said housing bottom wall, said ring permitting relative vertical adjustment between said membeiand said housing, and said bushing being the sole support for said member upon said housing so that'the' housingis insulated from vibrations in the motor andhead assembly.

13'. Fuel burner apparatus comprising amotor casing Having a; bottom part provided" with opening, a motor driven liquid fuel projecting unit having a lower end part extending through said'opening, and means resiliently mounting said unit on' said casing comprising a vertically elon' gated resilient anmiius inter osed between imner and outer more rigid: members surrounding said lower end part at said opening, means fixedly securing one of said members to one of said parts and a vertically adjustable telescoping connection between the other of said members and the other of said parts. 1 h V MILTON A. POWERS.

REFERENCES CITED Ti ie following" references are of record iii the file of this patent:

UNITED STATES Number Name Date fie-18,457 Lord 1 May 10', 1932 1,273,655 Overstroin July 23, 1918 15,707,474 9 7 1929 1,724,373 1929 1,728,011 1,929 1,750,016 1930 1,830,113 1931 1,891,835 1932 1,973,187 1934 2,004,346 1935 2,004,532 1935 2,005,639 Schroeder "et a1. 1 June 18, 1935 2,027,632 Chadwick et al. Jari. '14, 1936 2,030,367 Grave 1 Feb. 11, 1936 2,032,291 Lum Feb. 25 1936 Brinkert'1;. ;1 2, 2,113,020 Geyr Apr. 5, 1938 2,130,471 Powers Sept. 20, 1938 2,139,373 McKinley et a1. Dec. 6, 1938 2,161,220 Beckett June 6, 1939 2,181,249 Powers -11 1 1-- Nov. 28-, 1939 2,245,334 Fredlund' 1 June 10, 1941 2,265,053" Anderson Dec. 2, 1942 2,270,994 Cole 1.1 Jan. 27, 1942 2,301,818- Sackett 1 Nov, 10, 1942 FOREIGN PATENTS 

